Automatic gas lighting and extinguishing apparatus.



N0. 842,259. PATENTED JAN. 29, 1907.

N. H. SHAW.

AUTOMATIC GAS LIGHTING AND EXTINGUISHING' APPARATUS..

APPLICATION FILED JUNE 24. .1904.

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APPLICATION FILED JUNE 24. 19.04.

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UNITED STATES PATENT OFFICE. Y

NATHANIEL H. SHAW, OF BOSTON, MASSACHUSETTS.

Specification of Letters Patent.

Patented Jan; 29, 1907.

Application filed June 24, 1904. Serial No. 213,987.

To a/ZZ whom t 711/003./ concern,.- A

Beit known that I, NATHANIEL H. SHAW,

, a citizen of the United States, residing at Boston, in the county ofSuffolk and State of Massachusetts, have invented an Improvement inAutomatic Gras Lighting and Extinguishing Apparatus, of which thefollowing description, in connection with the accompanying drawings, isa specification, like letters on the ,drawings representing` like parts.

- This invention relates to a gas-burner of the Welsbach or mantle type,and its object is to provide a novel burner of this constructionk whichcan be eflicaciously used in connection with an automatic time mechanismfor lighting and extinguishing the burner.

The particular features wherein my invention resides will be hereinafterdescribed and then pointed out in the claims.

In the drawings, Figure l is a front elevation of my improvedgas-burner. Fig. 2 is a vertical transverse section through thegasconduit. Fig. 3 is a side view of the valvecasing. Fig. 4 is avertical section on the line :z: Fig. 2.V Fig. 5 is a view on the line9c', Fig. 3, looking to the left. Fig. 6 is a vertical section throughthe filter in Fig. 4. Fig. 7 is a side elevation showing the valvecasingandthe rod connecting the valve with the actuating mechanism, and Fig. 8is a section through the air-inlet ports of the pilotburner. The deviceherein illustrated is in som respects similar to that illustrated anddescribed in my former patent, No. 755,060, dated March 22, 1904, inthat it comprises a mantle-burner of some suitable type supportedby amember which in turn is secured to the lamp-post or other gas-supply,said member having a gas-conduit which connects with the main supply andwith the burner and being of such a shape that the conduit projectslaterally and downwardly to a valvel mechanism and thence upwardly andlaterally back again to the burner.

In the drawings, A represents a mantle gas-burner of any ordinaryconstruction, and B the mantle, which is rendered incandescent by theflame fromthe burner.

OV represents the right-'angular member which contains the gas conduitand supports the valve and also supports the time mechanism foroperating the valve. This member O is adapted to be secured to the topof the lamp-post over the mouth of the gasand to the burner.

supply, and is provided with a flange or foot 75 for attachment to thelamp-post; The member O has an inlet-opening 76, which communicates witha laterally and downwardly extending conduit b, leading to the valvehereinafter described., and it also has another conduit b2, leading fromthe valve H designates the casing in which is contained the timemechanism` for opening and closing the valve for the conduit b b2. Thisconstruction of the gasconduit member O has been adopted. in order thatthe burner may be placed directly over the main gas-supply, andtheautomatic time mechanism within the casing H may be placed at one sidethereof.

The valve for controlling the supply of gas tothe main burner is shownin Figs. 2, 3, and 7. It is received within a suitable valvecasing 92,which is shown as separate from and detachably secured to the conduitmember O. This valve-casing 92 has a port d, constituting a valve-seatfor the valve t', said port communicating with each of the conduits bb2; The valve has a guiding-stem h2, which operates in a suitable recess91 in the valve-casing, and the stem h of the valvel extends looselythrough a bushing g in the valve-casing. The upper end of the stem hassecured thereto an arm 27 which extends through a removable cap r abovethe valvestern and into the casing H for attachment to the timemechanism presently to be described.

The valve t is a double conical valve, and when it is closed one facethereof rests against the valve-seat of the port d, and thus closes theinlet-conduit t from the outlet-conduit b2 When the valve is opened, theother face thereof engages the lower end of the sleeve g, and therebyprevents. the escape of gas from around the valve-stem. In a device ofthis class it is very essential that the valve should work freely andalso that the valve should be non-leakable. The valve herein shown meetsboth of these requirements. There is no packing to bind and prevent itfrom working freely, and by making the valve a double one the gas isprevented from leaking around the valve stem when the valve is opened.The valve is also a selfcentering valve.

I employ in connection with my regular burner A a pilot-tube D, whichextends through the mixing-chamber 100 of the main burner and terminatesin a pilot-burner lo- IOO cated exterior to the main burner and withinthe mantle B. I propose to have the pilottube D constantly open to thegas-supply, so that the pilot burner will be constantly burning.

It is important, as will be obvious, to keep the mantle B free fromsmoke or soot, and if a continuously-operating pilot-burner of ordinaryconstruction is employed the mantle will in a short time become soblackened by smoke from the pilot-burner as to be unfit for use. Inorder to obviate this difliculty, I make the pilot-burner of the Bunsentype, so that the flame thereof will be invisible and combustion at theburner will be absolutely complete. For this purpose the tube D isformed in two parts connected by a sleeve 88, and in the mouth of itslower member is a conical tip t', provided with a port of the propersize. Just above this tip the sleeve is provided with lateral air-portsz, surrounded by a pendent hood K. This forms a Bunsen attachment forthe pilot, which causes a blue flame that will not smoke the mantle.

The pilot-tube D is tapped into the inletgas conduit I) at the upper endof the member c, as best shown in Fig. 4.

It will be noted that the valve 7l is at the point where the twoconduits b and b2 connect, and therefore the pilot-tube D is connectedto the gas-main between the gas-supply and the valve, and thepilot-burner therefore is continuously burning.

Since the tip of the pilot-burner is exterior to the main burner andsince the pilot-tube D is provided with air-ports e and is therefore aburner of the Bunsen type and also since the pilot-burner is acontinuously-operating one it will be obvious that when the main burneris lighted said pilot-burner becomes an auxiliary burner, and the heattherefrom augments that generated by the main burner. The pilot burnertherefore performs two functions-Erst, it acts as a means for ignitingthe main burner when the valve is opened, and, second, it assists themain burner in heating the mantle to incandescence.

The gas member C is shown as provided with a chamber 78, Which is boredlaterally in the said member C and intersects the conduit b. Thischamber is normally closed by a removable plug p, and within the chamberis placed some suitable filtering material 30, preferably felt soaked inoil. This filter, it will be noted, is placed between the gas-supply andboth the valve i and the pilot-tube D, and therefore the gas which isburned in either burner has to pass through the filter. I regard thisposition of the filter as of some importance, because by this means anyforeign material in the gas which would be liable to clog theconstantly-burning pilot-burner may be removed.

The member C is tapped into the lower end of theconduit b, as at 77, andinto the upper end ofthe conduit b2, as at 79, and thelaterally-extended portions of each conduit are also tapped into, as at80 and 81, screwthreaded plugs being provided to normally close theseopenings. By means of this construction any deposits which accumulate in.the conduits may be readily removed.

The time attachment I have herein shown for opening and closing the mainvalve i at predetermined times is sufficiently illustrated in Fig. 1. Ihave not attempted to show the complete time mechanism, which comprisesthe usual clock-train, as this may be of any suitable or usualconstruction. 15 designates a wheel which is driven by the clocktrainand is provided with a series of pins 16, designed to lift the free endof a weighted 1ever 17, pivoted at 19 within the casing H. On this leverthere is a rigid vertical arm 18, to the upper end of which is pivoted apallet 19, which engages in a toothed wheel or ratchet 21. A stop 20 isemployed to prevent backward rotation of the ratchet. -Irojecting fromthe ratchet are a plurality of pins 24, there being one-half as manypins as there are teeth in the ratchet. 23 is a camlever pivoted to thecase I-I and provided with two cam-faces 28 and 29, said faces being inposition to be alternately engaged by the pins on the ratchet 21. 'Thecam-lever 23 is provided with a counterbalance 25, situated above itspivotal point, so that the counterbalance is thrown first to one sideand then to the other of said pivotal point. Said cam-lever is alsoprovided with a fork 26, which embraces the arm 27, projecting from thevalve-stem. Each time that a pin 16 engages the lever 17 during therotation of the wheel 15 said lever is raised and the arm 19, carryingthe pin 22, is retracted to engage a ratchet-tooth of the wheel 21. Asthe pin 16 is freed from the lever 17 the latter falls and theratchet-wheel 21 advances one step. During the first step forward one ofthe pins 24 engages the cam-surface 28 and throws the cam-lever 23 fromthe full to the dotted line position, Fig. 1, thereby opening the valvei. Vhen the pin 16 again lifts the lever 17 and then releases thelatter, the cam 21 is moved a second step forward, and this time a pin24 engages the cam-surface 29, thereby throwing the cam-lever 23 andpermitting the valve to close.

I-Iaving described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A gas-burner com rising a member, having a gas-conduit andP alaterally-extending filter-chamber communicating with the conduit, afilter within thechamber, a removable plug to close the open end of thechamber, and a burner connected with the gas-conduit.

IOO

IIO

ISO

2. A gas-burner, a gas-conduit leading thereto and provided With avalve-seat, a

valve on the outlet side of said valve-seat and having a stem extendingloosely through an aperture in the Wall of the conduit on the outletside of the valve-seat, said valve having tWo faces one to cooperateWith said valve-seat and the other to close the aperture through whichthe stem extends When the v alve is open.

3. A gas-burner, a conduit leading thereto and provided With avalve-Seat, an automatically-closing valve on the outlet side of saidvalve-seat, said valve having a stern eX- tending loosely through anaperture in the Wall of the conduit on the outlet side of thevalve-seat, and having a face to close said aperture when the valve isopen.

4;. A gas-burner, a Conduit leading thereto and provided With avalve-seat, an automatically-closing valve on the outlet side of saidvalve-seat, said valve having a stem eX- tending loosely through anaperture in the Wall of the conduit on said outlet side of thevalve-seat, and having a face to close said aperture when the valve isopen, and means to act on the end of the stem to open the valve.

5. A main gas-burner, a gas-conduit leading thereto and provided With avalve-seat, a valve onk the outlet side of said valveseat, said valvehaving a stem extending loosely through an aperture in the Wall of theoonduit on said outlet side ofthe valve-seat, and having a Jaoe to closesaid aperture When the valve is open, a pilot-burner, a continuouslyopenpilot-tube connecting said pilot-burner to the gas-conduit between thegas-supply and said valve.

In testimony whereof I have affixed my signature in presence of tWoWitnesses.

' NATHANIEL H. SHAV. Witnesses:

O. M. SHAW,

A. H. EATON.

